clk: qcom: lcc-msm8960: change pxo_parent_data to static

The pxo_parent_data inroduced in commit bac4675a ("clk: qcom:
drop lcc-mdm9615 in favour of lcc-msm8960") is only used in lcc-msm8960.c
now, change it to static.

Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20230803082125.521849-1-yangyingliang@huawei.com


Signed-off-by: Bjorn Andersson <andersson@kernel.org>